JPS6149538B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention opens and closes a fluid passage by rotating a closing member having a partially spherical outer shape and rotatably disposed within the fluid passage. The present invention relates to a ball valve.

(Prior art) As seen in Japanese Patent Publication No. 32-266, a conventional ball valve has a closing member floating between two seal rings fitted in a fluid passage formed in a valve body. The closing member has a partially spherical shape and is provided with a spherical outer surface and a cylindrical through hole, and is configured to open and close the fluid passage by rotating the closing member. One end of a spindle for rotational operation extends from inside the fluid passage through a wall forming the fluid passage in the valve body to the outside of the valve body, and a seal is provided between the extending portion and the valve body. The other end of the spindle is formed into a tongue shape, and the closing member is provided with a groove that is adapted to the shape of the tongue-shaped other end of the spindle and extends in a direction perpendicular to the axis of the fluid passage. An extending recess is formed and the other end of the spindle is configured to slidably fit into the recess.

With this configuration, when the closing member closes the fluid passage, the spherical outer surface receives fluid pressure from one side, and the spherical outer surface on the opposite side seals in response to the fluid pressure. It comes into close contact with the ring and improves the sealing performance.

(Problem to be Solved by the Invention) However, although this product has the advantage that the sealing performance increases in accordance with the fluid pressure in the fluid passage, the higher the fluid pressure, the more the spherical outer surface becomes the seal ring. Since the contact is strong, there is a problem in that when rotating the closing member to open the valve, a high torque is required depending on the strength of the contact.

The present invention has been made in view of the problems of the prior art, and its purpose is to improve sealing performance in accordance with the fluid pressure within the fluid passage when the fluid passage is closed; Moreover, it is an object of the present invention to provide a ball valve in which the closing member can be rotated without requiring high torque corresponding to the fluid pressure when the valve is opened.

(Means for Solving the Problems) Therefore, the present invention includes a valve body 1 having a fluid passage 4, a valve body 1 disposed rotatably within the fluid passage 4, and configured such that the fluid passage 4 can be opened and closed by the rotation. and a closing member 2 having a partially spherical outer shape, and seal rings 11 and 12, which serve as seats for the closing member 2, are fitted to portions on both sides of the closing member 2 in the fluid passage 4. At the same time, spindles 9 and 10 are integrally provided in the closing member 2, and the spindles 9 and 10 are disposed on mutually opposite parts of the closing member 2 and are coaxial with each other, and their axes are aligned with the above-mentioned. One spindle 10 of the spindles 9 and 10 is disposed to cross the longitudinal axis of the fluid passage 4, and one of the spindles 10 is passed through the wall 3 forming the fluid passage 4 in the valve body 1. A socket 8 is extended to the outside of the valve body 1, and a socket 8 provided with a seal 7 such as a box seal is fitted onto the extended portion so as to be relatively rotatable, and the socket 8 and the wall portion (main body portion 3) are connected to each other. A sealing structure 6 is installed between them, and the sealing structure 6 is hollow and has the spindle 1 in its hollow part.
It has a wall structure 5 that allows the extending portion of 0 to pass through and surrounds the passing portion, and the wall structure 5
is formed in a bellows shape and is extendable and bendable, and the other spindle 9 of the spindles 9 and 10 is fitted into a recess 1b formed in a portion of the wall portion 3 opposite to the spindle 9. The outer surface of the spindle 9 is formed into a convex curved surface such that the axial center portion thereof has a maximum diameter, and the wall portion (main body portion 3)
In the hole 1b through which the one spindle 10 passes, there is a closing member 2 between the spindle 9 and the closing member 2 centered on the center of the outer surface of the other spindle 9 between the inner circumferential wall of the hole 1b and the one spindle 10. It is characterized in that a tilting allowance gap 17 is provided that allows integral tilting of the spindle 10 and the spindle 10.

(Function) As a result, in the ball valve of the present invention, the closing member 2
Due to the pressure of the fluid acting on the closing member, the closing member rotates around the center of the spindle 9 and presses the closing member against one seal ring 12, increasing the degree of close contact between the closing member and the seal ring 12. Internal leakage of fluid can be reduced, and when the closing member is rotated, the wall structure fitted onto the spindle 10 allows the wall structure to flex or curve in response to the movement of the tilting spindle 10, thereby closing the closure member. The movement of the parts is not obstructed, and the spindle 1
The sealing performance of the sealing structure against zero can be maintained.

Also, by operating the spindle 10 from outside the valve, the closing member can be pressed toward the seal ring, or vice versa, the closing member that is being pressed toward the seal ring can be moved in a direction away from the seal ring. Even if the valve internal pressure is high and the closing member is strongly pressed against the seal ring, the spindle 10 can be operated to reduce the contact between the closing member and the seal ring with a low torque. The pressing force can be changed in the direction of decreasing to the extent that the opening/closing operation can be performed, and the closing member can be rotated to an arbitrary opening position with low torque.

(Example) The present invention will be described in detail below with reference to the drawings.

The valve of FIGS. 1 and 2 consists of a valve body 1 and a valve closing member 2 formed as a partially spherical body, said closing member 2 having circular fluid passages 4 provided in the valve body 1 on both sides thereof. Holes 15 of the same diameter are provided. In FIGS. 1 and 2, the valve 1 is in the closed position and the aforesaid hole 15 is oriented transversely to the fluid passageway 4. In FIGS.

Two spindles 9, 10 are integrally connected to the closing member 2, one spindle 9
extends downwards, and the longer spindle (through spindle) 10 extends upwards. The spindle 9 is attached to the corresponding recess 1b of the main body part 3 which becomes the wall forming the fluid passage 4 in the valve body 1, and the spindle 10 is attached to the main body part 3 of the valve body through the members 5, 6, 7 and 8. It is attached to the corresponding hole 1b in the upper part.

On both sides of the closure member 2, the valve body 1 has annular transverse grooves 13 and 14 running transversely to the flow path and are provided with metal sealing rings 11 and 12.

When the valve is closed, the closing member 2 is under pressure, in order to enable the closing member 2 to be pressed against the sealing ring 11 or 12 arranged on the outlet side by the pressure build-up in the pipe arrangement. The difference allows for a slight rotation around point 16, for example to the right in FIG.

The circular cross-section of the spindle 9 therefore decreases upwardly and downwardly from the center, thereby forming a bearing surface or convex surface as shown. Around the spindle 10 in the bore 1b of the body part 3 there is a gap 17 sufficient for the closure member 2 to tilt. A pleated annular wall structure 5 surrounding the spindle 10 is connected to the body part 3. The annular wall structure 5 is made of a material such as metal, which can withstand pipe pressure, but can be bent to some extent due to its bellows-like shape, and is dimensioned to allow this.

Seal structure 6 through which the spindle 10 passes
is connected to the bellows-shaped portion by means of a so-called box seal. By pressing the seal socket 8 surrounded by the body part 18 of the seal structure 6 into the body part 18 by means of a bolt or the like (not shown), the spindle 1 is removed.
The seal 7 provided around the spindle 1
0 and pressed against the main body 18, the seal socket 8 is externally fitted onto the spindle 10 so as to be relatively rotatable.

With the above configuration, the closing member 2 and the spindle 10
can be tilted due to pressure differences within the pipe arrangement, in which case the closure member 2 is pressed against the seal 12 as shown in FIG.

Tilting is also possible by moving the spindle 10 from its top to the right or to the left.
When opening the valve, the closing member engages its spindles 9 and 1.
0, in which case the holes 15 are in the same direction as the fluid passages 4. However, the closing member 2
If the valve is pressed very strongly against the sealing ring 12, for example if the pipe pressure acting on the valve is particularly high, the closing member 2 can be removed from the outside of the valve by the spindle 1.
0 can be used to rotate the closure member 2 from an inclined position or a position in which it is pressed against the sealing ring 12 to a position in which it moves away from the seal or contacts the sealing ring 12 with a small pressing force; This allows the closing member 2 to be rotated at a desired position with low torque.

The operating state of the invention shown in FIG. 3 is essentially related to the similar valve shown in FIG. In FIG. 3, corresponding parts are designated by the same numerals with an a prefix. However, in the valve of FIG. 3, the box seal 6a as a sealing structure does not extend upwardly from the pleated wall portion 5a, but extends downwardly into the pleated portion thereof, so that the The structure 5a is arranged around the spindle 10 and the seal 7. Therefore, it differs from the valve of FIG. 1 in that it has a relatively large diameter. In the case of this example, the sealing performance of the box seal 6a can be further improved.

In FIG. 2, the valve is provided with a mechanism for opening and closing the valve. The mechanism consists of a hydraulic cylinder 19 mounted for rotation about a fixed point 20. Due to fluid pressure, the closure member 2 containing the spindle is forced to close the spindle 10
is rotated or tilted about point 16 via a piston rod 22 connected to a bearing 21 surrounding the piston.

The actual rotation of the closure member 2 into the open or closed position is carried out in the usual manner by a mechanism 23, which, by means of the valve structure of the invention, is held against the body part 3 by means of a support 24. The support device 24 allows said mechanism 23 to move along the spindle 10 when the closure member 2 is tilted or tilted; is configured to prevent rotation with respect to the body 3 of the valve. This is achieved, for example, by making the support 24 sufficiently flexible in the oblique direction or by connecting it, for example by a tap-ring connection.

(Effects of the Invention) As explained above, the present invention integrates the spindles 9 and 10 into the closing member 2, and both spindles 9,
10 are disposed coaxially on opposite sides of the closing member 2, and one spindle 10 is used for operating the closing member 2 from the outside of the valve body 1. A wall portion (forming the fluid passage 4 of the valve body 1) the other spindle 9 is positioned by fitting into a recess 1b formed in a portion of the wall portion facing the spindle 9;
Further, its outer surface is made into a convex curved surface having a maximum diameter at the center so that it can rotate around the center within the recessed portion 1b, and the portion of the wall portion (main body portion 3) through which the spindle 10 penetrates. A certain hole 1b has a rotation allowance between the inner periphery of the hole 1b and the outer periphery of the spindle 10, which allows the spindle 9, the closing member 2, and the spindle 10 to rotate together around the center of the spindle 9. A gap 17 is provided. Therefore, when the fluid passage 4 is closed, the closing member 2 and the spindles 9, 10 are integrated around the central part by receiving the fluid pressure in the fluid passage 4 on the spherical outer surface of the closing member 2. The closing member 2 rotates, and the closing member 2 is seated in close contact with either of the seal rings 11 and 12 in relation to the fluid pressure direction, so that the sealing performance is improved according to the fluid pressure.
Internal leakage can be prevented. By operating the spindle 10, the closing member 2 can be rotated around the central portion, so when rotating the closing member 2 to open the valve, the closing member 2 is rotated around the central portion. By rotating around the center, the closing member 2 can be separated from the seal rings 11 and 12 that are in close contact with each other, and the close contact force can be weakened, and a high torque corresponding to the fluid pressure is required. This results in the effect that the valve can be opened without any trouble. In addition, since the centers of the closing member 2 and spindles 9 and 10 rotate around the center portion thereof do not move, the closing member 2 can be easily and reliably separated from the seal rings 11 and 12 during the valve opening operation. Another advantage is that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the ball valve of the present invention in a state where fluid pressure causes the closing member to be inclined relative to the seal at the outflow end; FIG. 2 is a sectional view showing an embodiment of the ball valve of the present invention; FIG. 3 is a partially projected sectional view showing another embodiment of the ball valve of the present invention. 1... Valve body, 1a... Hole, 1b... Hole, 2
... Closing member, 3 ... Main body (wall), 4 ... Fluid passage, 5 ... Wall structure, 6 ... Seal structure,
7... Seal, 8... Socket, 9, 10... Spindle, 11, 12... Seal ring, 13,
14...Ring-shaped lateral groove, 16...Rotation center, 17
...Allowable rotation clearance.

Claims (1)

[Scope of Claims] 1. A valve body 1 having a fluid passage 4, and a partially spherical outer shape that is rotatably arranged within the fluid passage 4 and configured to open and close the fluid passage 4 by the rotation. a closing member 2 having said fluid passageway 4;
Seal rings 11 and 12, which serve as seats for the closing member 2, are fitted into both sides of the closing member 2, and the closing member 2 is integrally provided with spindles 9 and 10, and the spindles 9,
The spindles 10 are disposed at mutually opposite parts of the closing member 2 and coaxially with each other, with their axes intersecting the longitudinal axis of the fluid passage 4. One of the spindles 10 is extended to the outside of the valve body 1 by passing through the wall 3 forming the fluid passage 4 in the valve body 1, and a seal such as a box seal is attached to the extending portion. 7 is fitted onto the outside so as to be relatively rotatable, and a sealing structure 6 is mounted between the socket 8 and the wall 3;
The seal structure 6 is hollow and allows the extending portion of the spindle 10 to pass through the hollow portion, and
It has a wall structure 5 surrounding the part through which it passes,
The wall structure 5 has a bellows shape and is extendable and bendable, and the other spindle 9 of the spindles 9 and 10 is formed in a recess formed in a portion of the wall portion 3 facing the spindle 9. The outer surface thereof is formed into a convex curved surface so that the central part in the axial direction toward the spindle 9 has a maximum diameter, and the hole 1b in the wall portion 3 through which the one spindle 10 passes is provided with a convex curved surface. A rotation allowance gap 17 is provided between the inner circumferential wall of the hole 1b and the one spindle 10, which allows the spindle 9, the closing member 2, and the spindle 10 to rotate together around the center of the other spindle 9. A ball valve characterized by being provided with. 2 the wall structure 5 is connected to the wall portion 3 and the seal 7;
Claim 1, characterized in that the spindle 10 is arranged around the spindle 10 between
The ball valve described in section. 3. The wall structure 5 is arranged around the one spindle 10 and the seal 7 in order to connect the wall portion 3 and the seal structure 6. The ball valve described in .